Centrifugal process of lining tubes with a bituminous or like material



1933? G. REICHENBECHER EI'AL 1,939,521

CENTRIFUGAL PROCESS OF.LINING TUBES WITH A BITUMINOUS 0R LIKE MATERIALFiled Jan. 13. 1932 I I 1 I I l I l I I I 1 1 I I I I I I I l 1 I IINVENTOR3.

Gfiez'cbenbecher And i. Gra C A TTO YS.

Patented Dee. i2, 1933 iaiaszi PATENT orrics a WITH DIAL GAL PROCESS OFL'INING TUBES A BITUMINOUS OR LIKE MATE- Georg Reiohenbecher and ErnstGrubs, Mulheim- Rnhr, Germany, assignors to Verelnigte StablwerkeAktiengesellschatt, Dusseldorf, Germany Application January 13, 1932,Serial No. seasso, and in Germany Ianuary 13, 1931 Several processes arealready known, whereby metal tubes can be lined by means of thecentrifugal process with a coating of bitumen or the like or with amixture consisting of bitumen or 5 the like. The most widely knownprocess consists in bringing the tube to a temperature of about 150 C.and in projecting the liquid mass into the tube by suitable rotativemovement.

Another process consists in painting the inner 19 wall of the tube withsome suitable material in which bitumen is dissolved in volatile subugalprocess the tubes with the desired mass.

The first of these processes has the disadvantage that the mass does notadhere sufliciently strongly to the wall; the second process has thedisadvantage that some light, volatile constituents are left behind inthe painted coating, which later on volatilize through the action oi therays of the sun and detach the centrifuged mass from the tube wall, byforming cracks,

The present invention has the object oi eliminating the abovedisadvantages by bringing-the tube to a temperature which is higher-401'example, by 80 to 40--than the working or using temperature of thebitumen to be cast. After the heating of the tube the heated castingma-' state, will key well, and gradually form a coating or the desiredthickness. 1 In the attached drawing is shown in longitudinal section .atube of the character described.

Reference numeral denotes a metal tube, 11

the inside coating oi the tube, preferably applied with a brush, and 12the bituminous inner layer or lining applied warm and by centrifugalforce.

. What we claim and desire to secure by Letters 65 Patent in the UnitedStates is: stances, and in subsequently lining by the centrii- 1. Thecentriifugal process of lining tubes with a bituminous or likerust-preventing material, consisting in heating the tube to be coatedfrom c. to c. above the working temperature 7 of the rust-preventingmass to be cast, then painting the tube with a thin layer of the samerustpreventing mass, then cooling the tube, and then inserting into thetube a sufficient quantity or highly warmed 11mm; material to form acoating of-the-required thickness, then rotating the tube to depositsuch coating centriiugally.

2. JI'he centrifugal process oiiining tubes with a bituminous or likerust-preventing material, consisting in heating the tube to be coatedfrom 30 C. to 40 C. above the working temperature of the rust-preventingmass to be cast, then painting the tube with a thin layer of the samerust-preventing mass, then cooling the tube, and

of the required thickness has been deposited centrifugally.

GEORG REECHIENBECHER. ERNST GRUIBE.

